/Engine/Source/Runtime/Engine/Classes/Engine/World.h
Duplicate the editor world to create the PIE world.
static [UWorld](API\Runtime\Engine\Engine\UWorld) * GetDuplicatedWorldForPIE ( [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld, [UPackage](API\Runtime\CoreUObject\UObject\UPackage) * InPIEackage, int32 PIEInstanceID )